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Preparation method of silver-magnesium-nickel alloy belt (slice) and wire

A silver-magnesium alloy and silver-magnesium-nickel technology, which is applied in the field of silver-magnesium-nickel alloy strip and wire preparation, can solve the problems of large difference in silver-nickel density, unstable performance, brittleness, etc.

Active Publication Date: 2018-08-17
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silver-magnesium-nickel alloy prepared by this method has the following problems in the actual use process: (1) it is brittle, and the number of bending times cannot meet the requirements during the bending test; (2) the performance is unstable, and the parts processed from the same ingot Large difference in performance; (3) low yield; (4) poor reliability, and there is still a big gap between the failure level of relays and foreign countries
[0006] Nickel is not solid-soluble in the silver matrix, and the density of silver-nickel varies greatly. The silver-magnesium-nickel alloy prepared by melting and casting cannot control the distribution of nickel in the silver matrix, and thus cannot control the microstructure of the silver-magnesium-nickel alloy, resulting in poor performance of the silver-magnesium-nickel alloy. Stable, low yield, poor reliability

Method used

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  • Preparation method of silver-magnesium-nickel alloy belt (slice) and wire
  • Preparation method of silver-magnesium-nickel alloy belt (slice) and wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Using 1kg silver-magnesium alloy powder and 7.5g nickel nitrate powder as raw materials, the magnesium content in the silver-magnesium alloy powder is 0.24wt%.

[0025] 2. Dissolve 7.5 g of nickel nitrate in 50 ml of absolute ethanol.

[0026] 3. Put 1kg of silver-magnesium alloy powder in a ball mill bucket, add 300g zirconia balls, and add nickel nitrate ethanol solution, seal the ball mill pot, and ball mill the mixture for 5 hours.

[0027] 4. Dry the mixture and calcinate in a muffle furnace at 400°C for 1 hour. After calcination, the powder is reduced at 400°C in a hydrogen atmosphere for 1 hour.

[0028] 5. Hot-press sintering the powder after reduction treatment into a Φ28×30mm cylinder, the hot-pressing sintering temperature is 800℃, the hot-pressing sintering is 1h, and the pressure is 30MPa.

[0029] 6. The hot-pressed sintered cylinder is heated to 800°C, extruded in a steel mold, and the mold is heated to 400°C. The extrusion was carried out on a 400-ton 4-column...

Embodiment 2

[0032] 1. Using 1kg silver-magnesium alloy powder and 7.5g nickel nitrate powder as raw materials, the magnesium content in the silver-magnesium alloy powder is 0.24wt%.

[0033] 2. Dissolve 7.5 g of nickel nitrate in 50 ml of absolute ethanol.

[0034] 3. Put 1kg of silver-magnesium alloy powder in a ball mill bucket, add 300g zirconia balls, and add nickel nitrate ethanol solution, seal the ball mill tank, and ball mill the mixture for 5 hours.

[0035] 4. Dry the mixture and calcinate in a muffle furnace at 400°C for 1 hour. After calcination, the powder is reduced at 400°C in a hydrogen atmosphere for 1 hour.

[0036] 5. Hot-press sintering the powder after reduction treatment into a 70×30×8mm block, the hot-pressing sintering temperature is 800℃, the hot-pressing sintering is 1h, and the pressure is 30MPa.

[0037] 6. The hot-pressed sintered block is rolled into a 0.25mm thick strip (sheet) on a two-roll mill, with a deformation of 20% per pass.

[0038] 7. Keep the strip (sheet) m...

Embodiment 3

[0040] 1. Using 1kg silver-magnesium alloy powder and 12.78g nickel iodide powder as raw materials, the magnesium content in the silver-magnesium alloy powder is 0.24wt%.

[0041] 2. Dissolve 12.78g of nickel iodide into 50ml of absolute ethanol.

[0042] 3. Put 1kg of silver-magnesium alloy powder in a ball mill barrel, add 300g zirconia balls, and add nickel iodide ethanol solution, seal the ball mill tank, and ball mill the mixture for 5 hours.

[0043] 4. Dry the mixture and calcinate in a muffle furnace at 500°C for 1 hour. After calcination, the powder is reduced at 450°C in a hydrogen atmosphere for 1 hour.

[0044] 5. Hot-press sintering the powder after reduction treatment into a Φ28×30mm cylinder, the hot-pressing sintering temperature is 800℃, the hot-pressing sintering is 1h, and the pressure is 30MPa.

[0045] 6. The hot-pressed sintered cylinder is heated to 800°C, extruded in a steel mold, and the mold is heated to 400°C. The extrusion was carried out on a 400-ton 4-colu...

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Abstract

The invention discloses a preparation method of a silver-magnesium-nickel alloy belt (slice) and wire. The preparation method comprises the following steps of by taking silver-magnesium alloy powder and nickel containing powder as raw materials, performing ball milling and mixing on the silver-magnesium alloy powder and the nickel containing powder, calcining a mixture in air, performing heating treatment on the calcined mixture at a reduction atmosphere, sintering power after treatment into a dense body, rolling the dense body into a belt (slice) or extruding the dense body into a wire, and then performing internal oxidation on the belt (slice) and the wire to prepare the silver-magnesium-nickel alloy belt (slice) and wire. Different from the traditional smelting and casting technology, for the preparation method provided by the invention, by uniformly mixing the silver-magnesium alloy powder and the nickel containing powder, distribution of a nickel in a silver substrate is controlled, and preparation of silver-magnesium-nickel alloy with controllable component distribution and microstructure is realized.

Description

Technical field [0001] The invention relates to a method for preparing silver-magnesium-nickel alloy strips (sheets) and wires, and belongs to the technical fields of electrical contact materials, elastic contact materials, and electrical contact elastic elements. Background technique [0002] Silver-magnesium-nickel alloy has excellent elasticity and resistance to mechanical fatigue, as well as superior resistance to electrical erosion and reliable electrical contact. Because of this, the material has become a major player in my country’s aerospace, satellite communications, missiles, radars, and radio stations. Indispensable contact material in engineering equipment. On September 30, 1993, the National Defense Science, Technology and Industry Commission approved and issued the People’s Republic of China National Military Standard GJB 1740-93 "Specifications for Silver-Mg-Ni Alloy Strips (Sheets) for Aerospace Use", which was implemented on June 1, 1994. [0003] In the civil fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C19/03B22F9/04B22F9/22B22F3/14B22F3/20
CPCB22F3/14B22F3/20B22F9/04B22F9/22B22F2998/10C22C1/0433C22C19/03B22F2009/043B22F2003/145
Inventor 刘绍宏朱海澄崔浩刘满门陈家林周利民谢明孙旭东
Owner NORTHEASTERN UNIV
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